# FRANK Solutions for Class 9 Maths Chapter 18 - Rectilinear Figures

Understand polygons with Frank Solutions for ICSE Class 9 Mathematics Chapter 18 Rectilinear Figures. Learn to use the correct theorems for calculating the sum of interior angles of a polygon or sum of exterior angles of a polygon. Also, practise how to calculate the measurement of each angle of a polygon with our chapter solutions.

Revising the Frank textbook solutions for ICSE Class 9 Maths can help you to brush up the concepts on how to find the number of sides of a given polygon. Further, if you have any doubts related to rectilinear figures, visit the ‘UnDoubt’ platform at TopperLearning for answers from experts.

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## Chapter 18 - Rectilinear Figures Exercise Ex. 18.1

Question 1
Solution 1
Question 2
Solution 2
Question 3
Solution 3
Question 4
Solution 4
Question 5
Solution 5
Question 6
Solution 6
Question 7
Solution 7
Question 8
Solution 8
Question 9
Solution 9

Question 10
Solution 10
Question 11
Solution 11
Question 12
Solution 12
Question 13
Solution 13
Question 14
Solution 14
Question 15
Solution 15
Question 16(a)

Is it possible to have a polygon whose sum of interior angles is 780°?

Solution 16(a)

Question 16(b)

Is it possible to have a polygon whose sum of interior angles is 7 right angles?

Solution 16(b)

Question 17(a)

Is it possible to have a polygon whose each interior angle is 124°?

Solution 17(a)

Question 17(b)

Is it possible to have a polygon whose each interior angle is 105°?

Solution 17(b)

Question 18

A heptagon has three angles equal to 120°, and the other four angles are equal. Find all the angles.

Solution 18

Question 19

Solution 19

Question 20

In a polygon, there are 3 right angles and the remaining angles are equal to 165°. Find the number of sides in the polygon.

Solution 20

Question 21

ABCDE is a pentagon in which AB is parallel to DC and  Find angle A.

Solution 21

Question 22

If the difference between an exterior angle of a regular polygon of 'n' sides and an exterior angle of another regular polygon of '(n + 1)' sides is equal to 4o; find the value of 'n'.

Solution 22

Question 23

The number of sides of two regular polygons are in the ratio 2 : 3 and their interior angles are in the ratio 9 : 10. Find the number of sides of each polygon.

Solution 23

Question 24

Solution 24

Question 25

Solution 25

Question 26

Solution 26

Question 27

Solution 27

Question 28

Solution 28

Question 29

Solution 29

Question 30

Solution 30

Question 31

Solution 31

Question 32

Solution 32

Question 33

Solution 33

Question 34

Solution 34

Question 35

In a regular pentagon PQRST, PR = QT intersect at N. Find the angle RQT and QNP.

Solution 35

Question 36

Each exterior angle of a regular polygon is times of its interior angle. Find the number of sides in the polygon.

Solution 36

Question 37

Each interior angle of a regular polygon is 162°. Another regular polygon has number of sides double the first polygon. Find each interior angle of the second polygon.

Solution 37

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